I’m rebuilding a CR125 for stock moto and I believe it has the Mikuni 36mm carb on it (it says Mikuni and ‘TM’ on the side).

My question is, should I rebuild and run this carb or get something else? Is this the only carb I can use in stock moto? I ask because I have read that these are hard to tune (Don’t know if that’s true though). I will buy a full jet kit for this carb if it will help with tuning.